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You could try a couple of things: cider vinegar, diluted w/ equal parts water if it's not too bad, more vinegar than water if it's bad, soaking with solution for a a couple of hours to a couple of days and a little elbow grease, depending on the scale, should work well. You could use a cleaner used for coffee makers, but you may need a quantity depending on the size of your tank. Lemon juice might work too. All safe for dogs.

Thanks, I will try the some of these suggestions. Elbow grease might not be an option since all I have is a 2 inch filler tube. It would have to be something I could pour in and let it sit and disolve the scale.